研究目的
To design and fabricate a compact antenna on silicon substrate that covers UWB and X-band frequencies while providing high rejection at three specific notched bands (WiMAX, WLAN, and Downlink Satellite System) for use in imaging and wireless applications.
研究成果
The proposed antenna successfully achieves a compact design with triple band-notch characteristics, high gain, and good radiation efficiency, making it suitable for UWB and X-band applications in imaging and wireless systems. It demonstrates effective rejection of interfering bands and maintains stable performance across the operating bandwidth.
研究不足
The antenna's performance may be affected by impedance mismatches, particularly at the interface with SMA connectors. The compact size limits bandwidth and gain compared to larger antennas. Fabrication tolerances and material properties could lead to discrepancies between simulated and measured results.
1：Experimental Design and Method Selection:
The antenna design is based on a coplanar waveguide (CPW) feed with a hexagonal radiating patch. Notched bands are achieved by inserting an inverted T-shaped stub and etching C-shaped and rotated L-shaped slots. The design is optimized using electromagnetic (EM) simulation tools like HFSS and CST.
2：Sample Selection and Data Sources:
The antenna is fabricated on a high-resistivity silicon substrate (Electronic Grade Silicon, orientation 100, thickness 500±25μm, resistivity >8k?-cm).
3：List of Experimental Equipment and Materials:
Silicon substrate, SMA connectors, electrically conductive epoxy adhesive for fabrication, and anechoic chamber for radiation pattern measurements.
4：Experimental Procedures and Operational Workflow:
The antenna is designed, simulated, fabricated, and measured. Parameters such as VSWR, gain, radiation efficiency, group delay, and radiation patterns are analyzed. Time domain analysis is performed with two antennas spaced 250mm apart in face-to-face and side-to-side orientations.
5：Data Analysis Methods:
Data from simulations and measurements are compared. Equivalent circuit models are developed and analyzed using RLC components to understand impedance behavior at notched frequencies.
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